Bark is all tissues except vascular cambium, and its functional traits are important research objects to reflect plant ecological adaptation strategies. In order to reveal the characteristics and correlations of functional traits of twig bark of trees and shrubs in subtropical mountains, this paper analyzed the basic characteristics and correlations of the main functional traits of twig bark of 19 common woody plants in Wuyi Mountain using independent samples t-test and standard principal axis regression methods. The results found that (1) bark thickness, bark density and bark water content were not significantly different between trees and shrubs, with mean values of (0.78±0.06) mm, (0.58±0.03) g/cm³, and (155.07±14.16)%, respectively. The ecological stoichiometric characteristics of bark carbon (C), nitrogen (N) and phosphorus (P) also did not differ significantly between trees and shrubs, with mean values of (492.43±4.25) mg/g, (8.90±0.74) mg/g and (0.61±0.06) mg/g for C, N and P, respectively, and mean values of (60.76±4.17), (905.53±67.36), and (15.19±67.36) for C:N, C:P and N:P, respectively. (2) There were correlations between bark traits. Among them, the relationships between bark thickness and density, density and water content show allometric growth, while the relationships between bark thickness and water content, nitrogen content and phosphorus content show isokinetic growth. The relationships between tree bark carbon content and phosphorus content, shrub bark density and nitrogen content show allometric growth, and there is no significant difference between tree and shrub traits. The results of this study indicate that there is a convergence between the main functional traits of tree and shrub twig bark in the same subtropical mountain environment, reflecting similar adaptation strategies of woody plants in the same altitude environment.